David Lamb graduated from Ohio Wesleyan University in 1913, and was ordained a Methodist minister. He was serving as pastor of South Euclid Methodist Church in Cuyahoga, Ohio, when he enlisted in the U.S. Army as a corporal in 1917, and by November 1917 was promoted to Sergeant. He was sent to France with the American Expeditionary Force, serving with the machine-gun company of the 9th Infantry Division. In May 1918 he accepted a commission as a U.S. Army Chaplain, and was assigned to the 7th Machine-Gun Battalion, earning a Silver Star two months later.



